Every living entity is bound by different activities due to association with the modes of nature. As stated in Bhagavad-gītā, kāraṇaṁ guṇa-saṅgo 'sya sad-asad-yoni-janmasu: "This is due to his association with that material nature. Thus he meets with good and evil among various species." (BG 13.22)
We get different types of bodies among 8,400,000 species according to our karma. Karmaṇā daiva-netreṇa: (SB 3.31.1) we work under the influence of material nature contaminated by the three modes, and thus we get a certain type of body according to superior order. This is called karma-bandha. To get out of this karma-bandha, one must engage himself in devotional service. Then one will not be affected by the modes of material nature.
- māṁ ca yo 'vyabhicāreṇa
- bhakti-yogena sevate
- sa guṇān samatītyaitān
- brahma-bhūyāya kalpate
"One who engages in full devotional service, who does not fall down in any circumstance, at once transcends the modes of material nature and thus comes to the level of Brahman." (BG 14.26) To remain immune from the material qualities, one must engage himself in devotional service—śravaṇaṁ kīrtanaṁ viṣṇoḥ (SB 7.5.23). That is the perfection of life. When Mahārāja Bharata took birth as a brāhmaṇa, he was not very interested in the duties of a brāhmaṇa, but within he remained a pure Vaiṣṇava, always thinking of the lotus feet of the Lord. As advised in Bhagavad-gītā: man-manā bhava mad-bhakto mad-yājī māṁ namaskuru (BG 18.65). This is the only process by which one can be saved from the danger of repeated birth and death.